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3 years ago

2. Use the diagram below to answer this question. As the ball moves from point A

Physics

1 answer:

Thepotemich [5.8K]3 years ago

5 0

Answer:

at point A the ball possess pontetial energy , point B kinetic energy then point C pontetial energy

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A 12-kg lead brick falls from a height of 1.9 m. (c) The brick falls onto a carpet, 2.0 cm thick. Assuming the force stopping it

Genrish500 [490]

Answer:

F = -11199.63 N

Explanation:

given,

mass of the brick = 12 Kg

height of the fall, h = 1.9 m

thickness of the carpet = 2 cm = 0.02 m

average force = ?

velocity of brick just before hitting mat

$v = \sqrt{2gh}$

$v =\sqrt{2\times 9.81\times 1.9}$

v = 6.11 m/s

velocity of brick just before hitting ground= 6.11 m/s

final velocity = 0 m/s

using equation of motion for acceleration calculation.

v² = u² + 2 a s

0² = 6.11² + 2x a x 0.02

$a = -\dfrac{6.11^2}{0.04}$

a =-933.3025 m/s²

now, average force is equal to

F = m a

F = 12 x (-933.3025)

F = -11199.63 N

negative sign represent the decelerating force.

8 0

3 years ago

Four toy racecars are racing along a circular race track. The cars start at the 3-o'clock position and travel CCW along the trac

xeze [42]

Answer:

in t seconds, Car A sweep out t radian { i.e θ = t radian }

Explanation:

Given the data in the question;

4 toy racecars are racing along a circular race track.

They all start at 3 o'clock position and moved CCW

Car A is constantly 2 feet from the center of the race track and moves at a constant speed

so maximum distance from the center = 2 ft

The angle Car A sweeps out increases at a constant rate of 1 radian per second.

Rate of change of angle = dθ/dt = 1

Now,

since dθ/dt = 1

Hence θ = t + C

where C is the constant of integration

so at t = 0, θ = 0, the value of C will be 0.

Hence, θ = t radian

Therefore, in t seconds, Car A sweep out t radian { i.e θ = t radian }

6 0

3 years ago

A negatively charged particle (charge = -1e) has a velocity of 6.0 × 106 m/s in the positive x direction at a point where the ma

Anni [7]

Answer:

$a=2.6x10^{18} m/s^2$

Explanation:

$v=6.0x10^6 m/s$ , $q=1.6x10^{-19}C$ , $q=9.11x10^{-31}kg$

$\beta=\beta_x=3.0T$ , $\beta_y=1.5 T$ , $\beta_y=2.0 T$

$F_b=q*\left[\begin{array}{ccc}i&j&k\\6x10^6&0&0\\3&1.5&2\end{array}\right]$

$F_b=-1.6x10^{-19}C*[-12x10^6 j + 9x10^6 k]$

$F_b=m*a$

$19.2x10^{-13}j-14.4x10^{-13}k=m*a$

$a=\frac{19.2x10^{-13}}{9.11x10{-31}}-\frac{14.4x10^{-13}}{9.11x10{-31}}$

$a=2.107 x10^{18}j-1.58x10^{18}k$

$a=\sqrt{(2.107x10^{18})^2-(1.57x10^{18})^2}$

$a=2.6x10^{18} m/s^2$

7 0

3 years ago

If the atoms that share electrons have an unequal attraction for the electrons is called

Karolina [17]

If the atoms that share electrons have an unequal attraction for electrons, the bond is called a Polar covalent bond.

<h3><u>Explanation:</u></h3>

A covalent chemical bond is formed in case of two different non-metals when one or more electron pairs are shared between bonding atoms. A difference in electronegativity of subsequent atoms of a covalent bond leads to formation of a small net charge around nucleus of each atom, pulling the shared electrons to one side of the bond, to the nucleus which has higher electronegativity.

HCl is an example of polar covalent bond and the HCl bond has Chlorine more electronegative. The bonding electrons are more close to Cl than H and hence Cl is partially negatively charged than H which has partial positive charge (HCl bond : $H^{+} - Cl^{-}$ ). When electrons shared in a covalent bond have equal attraction, the bond is a Non-Polar covalent bond.

6 0

3 years ago

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. -2 D.

Alecsey [184]

C. 2-

electrons have a negative charge, thus adding two electrons to an atom will give it a charge of 2 times -1 or -2

6 0

3 years ago

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